Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942ed12fddb0bdc69ef76a7d93473391baf2a447c12dc63885c3a5711fddc19c' 
  AND token = 'c4d1KqJHB2bddmeJNecd2DS5/eRjpDhXNV/QCGULv7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}